[PATCH 1/2] RISC-V: Add quotes to #error messages

[PATCH 1/2] RISC-V: Add quotes to #error messages

In commit 1aaf3a64e92a ("[PATCH] RISC-V: Deduplicate #error messages in
testsuite"), the author made a mistake to miss the test after adding
quotes around extension names.  To avoid future errors and for consistency
with other #error uses in the RISC-V testsuite, this commit quotes #error
messages where necessary to avoid current test case failures.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/zvkn.c: Quote #error messages.
	* gcc.target/riscv/zvkn-1.c: Ditto.
	* gcc.target/riscv/zvknc.c: Ditto.
	* gcc.target/riscv/zvknc-1.c: Ditto.
	* gcc.target/riscv/zvknc-2.c: Ditto.
	* gcc.target/riscv/zvkng.c: Ditto.
	* gcc.target/riscv/zvkng-1.c: Ditto.
	* gcc.target/riscv/zvkng-2.c: Ditto.
	* gcc.target/riscv/zvks.c: Ditto.
	* gcc.target/riscv/zvks-1.c: Ditto.
	* gcc.target/riscv/zvksc.c: Ditto.
	* gcc.target/riscv/zvksc-1.c: Ditto.
	* gcc.target/riscv/zvksc-2.c: Ditto.
	* gcc.target/riscv/zvksg.c: Ditto.
	* gcc.target/riscv/zvksg-1.c: Ditto.
	* gcc.target/riscv/zvksg-2.c: Ditto.